Heating and cooling unit

ABSTRACT

A heating and cooling unit having a fan mounted in a housing for circulating air through the housing. The air passing through the housing is selectively directed over either a heat exchanger or a riser heat exchanger in the housing in accordance with predetermined temperature requirements. Hot water is circulated through the heat exchanger and cold water through the riser heat exchanger.

United States Patent Whalen [54] HEATING AND COOLING UNIT [72] Inventor: James J. Whaler], 5528 Warwick, Chevy Chase, Md. 20015 22 Filed: Aug. 29, 11969 21 Appl. No.1 854,038

[52] U.S.Cl ..l65/39, 165/48, 165/50 [51] Int. Cl ..B60h l/00 [58] Field of Search ..165/35, 39, 48, 50, 49, 22,

[56] References Cited UNITED STATES PATENTS 2,739,794 3/1956 Graham ..l 65/22 Mar. 14, 1972 3,074,477 1/1963 Whalen ..165/50 2,794,624 6/1957 Campagna'etal. ..165/50 Primary Examiner-Charles Sukalo Attorney-Lane, Aitken, Dunner & Ziems [5 7] ABSTRACT A heating and cooling unit havinga fan mounted in a housing for circulating air through the housing. The air passing through the housing is selectively directed over either a heat exchanger or a riser heat exchanger in the housing in accordance with predetermined temperature requirements. Hot water is circulated through the heat exchanger and cold water through the riser heat exchanger.

9 Claims, 15 Drawing Figures PATENTEDMAR 14 m2 SHEET 1 BF 6 WHWMMEEH WNVENTUR JAMES J. WHALEN FIGJ.

ATTORNEYS PATENTEDMAR 14 I972 42 IO v IINVENTOR JAMES J. WHALEN TORNEYS PATENTEDMAR 14 I972 SHEET 3 OF 6 FIG. #2.

F N 61 I.

IINVENTOR JAMES J. WHALEN WWW 2am A onmmrs PATENTEBMAR 14 1972 116M166 SHEET or 6 FIG.9.

8 mvmmn 32 B JAMES J. WHALEN 4O lflsom u \\v\\ 22 i s2 84 M Mi ATTORNEYS PAIENTEDMAR 14 m2 3, M8 7'66 sum 5 OF 6 FIGJO.

ENVENTQR 1 JAMES J. WHALEN A ORNEYS HEATING AND COOLING UNIT BACKGROUND OF THE INVENTION This invention relates to room heating and cooling units for multiple story buildings, and more particularly to a heating and cooling unit in which air from a room is directed over a heat exchanger or a riser heat exchanger in the unit to heat or cool the air.

Two and four pipe hot and cold water systems are well known for heating and cooling buildings. In these systems, heat exchange or fan coil units are provided in the-various rooms of the building and are connected to two or four risers which, in turn, are connected to water heating, or water cooling apparatus to heat or cool the water circulating through the room heat exchange units. A fan is mounted in each heat exchange unit to circulate room air through the unit to heat or cool the room.

The four pipe systems supply both hot and cold water to each heat exchange unit so that the rooms in the building can be heated or cooled in any season. However, the prior art four pipe systems are expensive because they require four pipes to be run on each floor of the building from the four risers to each of the heat exchange units. This involves not only the cost of the pipe runs but also the high labor cost of the pipe fitters for installing the pipe run outs and risers.

SUMMARY OF THE INVENTION It is an object of the present invention to provide package heat exchange units which can be easily installed in a building with a minimum of pipe fitting and electrical labor.

It is another object to provide a unit of the above type which basically is a two pipe unit, but which is designed and adapted to have parts added to it during production at the factory to make a four pipe unit so that the number of different parts needed to make two and four pipe units is minimized.

Briefly summarized, the two pipe heating and cooling unit of the present invention comprises an elongated housing, a fan disposed in the housing for circulating air through the housing, a pair of risers extending through the housing which are finned in a manner to form a riser heat exchanger, and an elongated damper blade in the housing to control the flow of air over the riser heat exchanger. In the four pipe unit an additional pair of insulated risers are mounted on the housing and a hot water heat exchanger is mounted in the housing and connected to the insulated risers. The same damper blade is used to control the flow of air over the riser heat exchanger or the hot water heat exchanger.

BRIEF DESCRIPTION OF THE DRAWINGS Reference is now made to the accompanying drawings for a better understanding of the nature and objects of the present invention. The drawings illustrate the best mode presently contemplated for carrying out the objects of the invention and are not to be construed as a restriction or limitations on its scope. In the drawings:

FIGS. I and 2 are a front elevational view and a side elevational view, respectively, of a four pipe heating and cooling unit embodying features of the present invention;

FIGS. 3 and 4 are vertical crosssectional views of the units of FIGS. 11 and 2, respectively.

FIG. 5 is a perspective view of a heat exchanger utilized in the unit of FIGS. I4l;

FIG. 6 is a fragmentary view showing U-shaped turn around and a valve connected to the end of the riser heat exchanger according to the present invention;

FIGS. 7, II, 9 and are enlarged horizontal cross-sectional views taken along the lines 7-7, 8-8, 9-9, and IIIIII, respectively, of FIG. 3 with the housing top plate being removed in FIG. 8;

FIG. 11 is a perspective view of the unit of FIGS. 1-41;

FIG. 12 is a perspective view of the damper blade utilized in the system of the present invention;

FIGS. 13 and M are fragmentary vertical sectional views depicting the fan utilized in the present invention, along with its associated structure; and

FIG. I5 is a view similar to FIG. 9, but showing the system converted for two pipe operation with the riser heat exchanger only.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring specifically to FIGS. I and 2 an individual heating and cooling unit embodying features of the present invention is shown. The unit comprises a housing 10 having an air inlet I2 and an air outlet 14 formed in the front wall thereof with grills provided over the inlet and outlet as shown. A thermostat I6 is mounted on the front wall of the housing for con trolling the heating and cooling operations, as will be described in detail later.

Referring to FIGS. 3 and I, a riser heat exchanger I8 extends the length of the housing II). The riser heat exchanger I8 is made up of a pair of spaced, parallel, cold water risers or pipes 20 which extend through the top and bottom of the housing. A plurality of spaced, parallel, heat conducting fins 22 are press fit on the risers 20 over substantially the entire length of the housing. It is understood that these fins may be arranged in a conventional manner to provide for the drainage of water that condenses thereon. The riser heat exchanger 18 is mounted so that it can slide or shift longitudinally a small distance relative to the housing 10 in response to expansion and contraction caused by temperature variations as will be described.

A separate hot water heat exchanger 24 is shown also mounted in the upper portion of the housing 10. As best seen in FIG. 5, it comprises a U'shaped conduit 26 having a pair of manually operated valves 28 mounted on each leg and an electrically operated valve 30 mounted on one leg to control the flow of hot water therethrough, the latter valve being controlled by the thermostat I6. A plurality of spaced, heat con ducting fins 32 are provided on the Ushaped conduit 26 in a conventional manner.

As shown in FIG. 3, the heat exchanger 24 is mounted in the housing I0 adjacent to the heat exchanger I8 with each branch of the conduit 26 being connected by pipes 34 to a pair of hot water risers 36. The risers 36 are surrounded by insulation and enclosed by an elongated subhousing 10a mounted on the housing I0. The risers 36 extend beyond the top and bottom of the subhousing as shown.

When the units are stacked vertically in a multi-story build ing, as disclosed in my earlier U.S. Pat. No. 3,074,777 granted on Jan. 22, 1963, the risers 20 and 36 of the adjacent units are connected together to form a continuous flow circuit. Conventional water heating and water cooling units are positioned in thebasement and connected to the ends of the risers of the lowermost heat exchange unit so that cold water is circulated up one of the risers 20 to the top unit and back down the other risers 20. In a similar manner, hot water is circulated up and back down through the risers 36. If desired, the water cooling unit can be positioned on the roof of the building and the cold water flow through the risers 20 reversed.

Referring particularly to FIGS. 3 and 4, a horizontal plate 40 is provided across the housing 10 to divide it into an upper and lower position. The configuration of plate 40 is designed to accommodate the various conduits and air ducts as will be described. A conventional scroll fan 42 which draws air axially in both ends thereof and forces it tangentially through an outlet 43 is mounted in the lower portion of the housing with the outlet 43 connected to a duct 44 formed within the housing III. The arrangement is such that, in assembly, the outlet 43 of the fan is brought in registry with and interlocked with the lower end of the duct Ml. A strap 46 having one end fixed to a flange on one edge of the end of the duct 44 is looped around the fan and its free end is bolted to a flange on the opposite edge of the end of the duct. An elongated bolt is used so that the strap can be drawn tight. In this manner, the fan can be positioned and secured within the housing with a minimum of effort and securely enough to resist coming loose during shipment of the unit 10. r

The fan 42 is mounted in a cocked position so that its axis is not perpendicular to the longitudinal axis of the housing as best seen in FIGS. 3 and 13. This is an important feature which minimizes air turbulence between the left inlet of the fan and the left wall of the unit 10, and therefore, reduces noise.

The duct 44 registers with an opening in the plate 40 so that, in operation, air is drawn inwardly from the inlet 12 into both ends of the fan 42, and then forced out from the fan through the duct 44 and the opening in the plate 40 into the upper portion of the housing 10. A wall 50 and curved wall 54 are provided in the lower portion of the housing as viewed in FIGS. 3, l0, l3 and 14 between the inlet I2 and the fan 42. The curved wall 54 extends over the portion of the fan which projects beyond the wall 50. An opening 51 is formed in the wall 50 and the curved wall forms a side opening 56 thereabove to permit air from the inlet 12 to pass directly into the fan area under certain conditions, as will be described in detail later.

A vertical channel shaped member 60 extends substantially the entire length of the housing alongside the riser heat exchanger 18 and the heat exchanger 24 in the upper portion of the housing as will be apparent from FIGS. 8, 9 and 11. The member 60 forms a main longitudinal support member for the unit and aids in directing the flow of air in the upper and lower portions of the housings, as will be explained in detail later.

As shown in FIG. 8, a pair of walls 62 and 64 having a common diagonally extending edge 66 extend upwardly from the plate 40 to a plate 90 mounted on the upper end of the member 60. The walls define an air duct which registers with the duct 44 below the plate 40. The walls 62 and 64 and the plate 90 are arranged so that the air from the fan 42 must flow horizontally through the heat exchangers l8 and 24 in the upper portion of the housing before it can flow up and out the outlet 14 which is located above the plate 90.

A damper motor 70 is mounted on the inner wall of the duct 44 and controls the movement of a linkage assembly 72 connected to a damper blade unit 80. The damper blade unit is best seen in FIG. 12. It comprises an upper damper blade 82, a lower damper blade 84 offset approximately 45 with respect to the blade 82 and a small damper blade 85 offset at an angle to the lower blade 84. The damper blades are mounted on an elongated member 86 which, in turn, is pivotally connected to the side edge of the support member 60 by means of a continuous flexible hinge or strap 88 to mount the damper blade unit for pivotal movement within the housing.

FIG. 10 depicts the two extreme positions of the lower damper blade 84 attained by actuating the linkage assembly 72 by the motor 70. Specifically, the blade 84 can be moved from a position shown by the solid lines, in which it blocks direct air flow through the lower portion of the riser heat exchanger 18, to a position shown by the dotted lines, in which it covers the opening 56 in the plate 54 to block direct air flow between the housing inlet 12 and the fan 42. In this latter posi tion, the small damper blade 85 also covers the opening 51 below the opening 56 and, therefore, air from the inlet 12 must pass through the lower portion of the riser heat exchanger 18 in order to reach the fan 42.

The above-mentioned actuation of the damper blade unit will also move the upper damper blade 82 from the position shown by the solid lines in FIG. 9 to the position shown by the dotted lines. In the solid line position, air from the fan is tioned above this plate 90 and, therefore, above the upper ends of the heat exchangers. As previously described, the plate 90 closes off the upper end of the duct formed by the walls 62 and 64 so that the air must pass through one or the other of the heat exchangers before it can flow upwardly and out through the outlet 14.

A long drain pipe 94 is mounted within the housing 10 with its upper end extending through the upper plate 90 and through the top of the housing 10. The lower end of the pipe closely overlies a drain hole 100 in a condensation pan 96 which encloses the bottom of the housing I0 and is adapted to collect condensation from the fins 22 of the riser heat exchanger. The lower end of the drain pipe 94 is notched as shown by the reference numeral 98 in FIG. 14 to enable con densate to drain from the pan through the drain hole 100. A short length of drain pipe 99 extends from the drain pan a distance equal to the projection of the risers 20 and 36. The upper end of the pipe 99 is crimped to the edge of the drain hole 100.

With this construction, condensation from a unit on the top floor of a building can pass directly through the drain pipes of the units in the lower floors without accumulating in the drain pans of any of the lower units. This is achieved while still permitting the condensation from each unit to collect in its respective drain pan and pass through the notches 98 of the drain pipe 94 associated with that unit, into and through the drain pipe 99 connected to the drain pan, and then through the drain pipes of the lower units without collecting in the drain pans of the lower units. The drain pipe 99 associated with the bottommost heat exchange unit will drain into the drainage system for the building,

When a multiple story building is to be heated and cooled, the four pipe units will be stacked vertically with one unit on each floor. The risers 20 of the units are connected together and the risers 36 are connected together. The risers 20 of the unit on the bottom floor are connected to a cold water source and a hot water source, respectively, located in the basement of the building. As previously mentioned, the cold water source may be positioned on the roof of the building rather than in the basementv in which case the flow through the risers 20 would be reversed. The upper end of each of the drain pipes 94 is connected to the drain pipe 99 extending prevented from circulating through the upper portion of the downwardly from the condensation pan 96 of the unit immediately there above. For most buildings more than one unit will be required for each floor and, therefore, a plurality of vertical stacks of the units will be used and connected as just described.

Since all of the stacked units operate identically, it will be sufficient to describe the operation of one individual unit of one stack in detail. Assuming that cooling is desired, a function switch associated with the thennostat 16 is switched to the cooling mode and the thermostat thereafter automatically controls the operation of the damper motor 70 in response to room temperature changes. In the cooling mode, the fan 42 runs continuously, the electrically operated valve 30 is deenergized and closed, and water from the cold water source is continuously circulated through the risers 20. When the room requires cooling, the thermostat energizes the damper motor 70 to move the damper unit so that the lower damper blade 84 covers the opening 56 formed in the wall 54 as shown by the dotted lines in FIG. 10, and the short damper blade covers the opening 51 therebelow. Therefore, air drawn through the inlet 12 is directed to the right as viewed in FIG. 10 through the fins 22 on the lower portion of the riser heat exchanger 18 in a direction indicated by the arrow A. Thus the air is pre-chilled before it enters the fan 42 as shown in FIGS. 13 and 14.

The air is then blown upwardly through the duct 44 past the member 40 and is directed by the walls 62 and 64 toward the upper portion of the riser heat exchanger 18 in the upper portion of the housing 10. The aforementioned movement of the damper blade unit by the damper motor 70 also moves the upper damper blade 82 to the position indicated by the dotted lines in FIG. 9 to block flow of air through the fins of the hot water heat exchanger 24. The air will thus flow in the direction indicated by the arrows B in FIG. 9, through the cooled fins 22 of the upper portion of the riser heat exchanger l6, and then upwardly and outwardly through the outlet Ml into the room being cooled.

When the room temperature drops below the thermostat setting the thermostat actuates the damper unit 60 to the solid line position shown in FIG. 10 so that the air bypasses the riser heat exchanger. In this position the air will pass through the heat exchanger 24, but since the electric valve 30 is closed in the cooling mode, hot water is not circulating through heat exchanger 24! and, therefore, the air is not heated.

In the event it is desired to heat the room, the function switch on the thermostat is actuated to the heating mode to enable the thermostat to control the operation of the electrically operated valve 36 and thus determine whether hot water from the risers 36 circulates through the heat exchanger 24 In the heating mode the fan 42 runs continuously and the amount of heating is regulated by opening and closing the valve 36 automatically by the thermostat 116. When the room temperature drops, the thermostat energizes the valve so that it opens to allow hot water to circulate through the heat exchanger 26. When the room is brought up to temperature, the thermostat de-energizes the valve so that it closes and blocks flow through the heat exchanger.

Switching to the heating mode causes the damper motor 70 to move the damper blades 82 and M to the heating position shown in FIG. ill, and shown by the solid lines in FIGS. 9 and it). In this position, the damper blade 84 blocks air flow through the lower portion of the heat exchanger 19 and no longer covers the opening 56 in the wall 56. The small damper blade is also moved away from the opening 51. Consequently, air from the inlet l2 will pass directly through the openings 5i and 56 into the fan without passing over the riser heat exchanger lltl as indicated by the arrows C in FIG. 16. As in the cooling mode, air flowingupwardly from the fan 42 and the duct will be directed by the walls 62 and 64 toward the heat exchangers in the upper portion of the housing as shown in FIG. 9. As a result of the above-mentioned movement of the damper unit 66, the upper damper blade 62 is in the position shown by the solid lines in FIG. 9, thus preventing any air circulation through the riser heat exchanger l6, and directing the air in the direction indicated by the arrows D through the heated tins 32 of the heat exchanger 24 and then upwardly to the outlet M and out into the room.

Alternatively, the heating and cooling of the four pipe unit can be controlled by a thermostat which does not have a manually controlled function switch. The thermostat has a well known dead band centered about the selected temperature. In this dead band range, the fan 42 is de-energized. When the temperature of the room rises, the thermostat automatically places the unit in the cooling mode with the fan ener' gized to cool the room. When the room temperature drops, the thermostat automatically places the unit in the heating mode to heat the room.

In a two pipe system, the riser heat exchanger lltl is used for both cooling and heating and the heat exchanger 24, the housing ltla, the pipes 36 and risers 36 are simply omitted. When the building is to be cooled, the risers 26 of the riser heat exchanger l8 are connected to a water cooling unit to circulate cold water through the risers. When the building is to be heated the risers are connected to a hot water source to circulate hot water through the risers. In either arrangement, the fan 62 is run continuously and the amount of the heating or cooling is regulated by movement of the damper unit 66 which is controlled automatically by the thermostat 16.

As best seen in FIGS. l0 and 115, the damper blades 82 and M are moved between the two positions shown by the solid lines and dotted lines to control the continuous flow of air through the unit. For example, when the thermostat calls for more heat or cold air, the damper motor moves the lower damper blade tl l to the position shown by the dotted lines in FIG. l0. Air is thus directed from the inlet 12 over the fins 22 so that it will be pre-chilled or pr'e-heated (depending on whether hot or cold water is circulating through the risers) before it enters the fan 62. As a result of the above-mentioned movement of the damper unit, the upper damper blade 62 is in the position shown by the dotted lines in FIG. 15. This permits the air from the fan to pass through the upper portion of the heat exchanger lltl to heat or cool the air further before it passes out the outlet M.

When the room is brought to the desired temperature, the thermostat energizes the damper motor 70 to move the damper blade unit to the position shown by solid lines. In this position the air circulates through the unit 10 without passing through the heat exchanger l6. ln this two pipe arrangement, a perforated plate 11116 is inserted as shown in FIG. 15 to provide a resistance to air flow which simulates the resistance of the heat exchanger 24 which is not used in the two pipe unit. This ensures that air will circulate through the unit at substan tially the same rate in both positions of the damper blade unit.

From the foregoing, it will be apparent that the heating and cooling unit of the present invention is particularly adapted to be manufactured as a two pipe or a four pipe unit. Each unit is completely self-contained and includes the room thermostat and function switch, the necessary electric circuitry, valves, risers and so forth. To install the units, it is only necessary to provide holes or openings on each floor so that the risers and drain pipe projecting from the bottom of each unit can extend through the floor and be connected to the upper ends of the corresponding pipes of the unit on the floor below.

What is claimed is:

ll. A unit for heating or cooling air in a multistory building comprising an elongated housing, a fan disposed in said housing for circulating air through the housing, an elongated heat exchanger longitudinally disposed in said housing, said heat exchanger including two risers extending therethrough, means on both ends of said unit to enable the risers thereof to be con' nected to the risers of similar units on floors above and below said unit, and means in said housing for directing the .flow of air through said housing in one or the other of two separate paths, said means including a damper blade unit for directing the air through said one path when in a first position ,and through said other path when in a second position, air flowing through said one path passing over the riser heat exchanger and air flowing through said other path bypassing said riser heat exchanger.

2. The unit of claim ll including a remote controlled damper motor for moving said damper blade unit to said first and second positions.

3. The unit of claim 2 including means in said other pathfor reducing the flow of air therethrough so that approximately the same cubic volume of air per minute is circulated through said unit by the fan in both said one and other paths.

6. A heating and cooling unit for a multi-story building comprising an elongated housing, a fan disposed in said housing for circulating air through the housing, an elongated cold water riser heat exchanger longitudinally disposed in said housing for cooling said air, means in said housing for directing the flow of air through said housing in one or the other of two separate paths, said means including a damper blade unit for directing the air through said one path when in a first position and through said other path when in a second position, air flowing through said one path passing over the riser heat exchanger and air flowing through said other path bypassing said riser heat exchanger, a remote controlled damper motor for moving said damper blade unit to said first and second positions, a pair of hot water risers mounted on and extending longitudinally of said housing, a hot water heat exchanger positioned within the upper portion of said housing in said other path for heating said air, said hot water heat exchanger being connected to said hot water risers, a remote controlled valve for controlling the circulation of water through said hot water heat exchanger, function switch means for controlling said damper motor to move said damper blade unit to said first and second positions, and a thermostat for opening and closing said valve in response to room temperature changes when said damper blade unit is in said second position and for turning said fan on and off in response to room temperature changes when said damper blade unit is in said first position, means on both ends of said heating and cooling unit to enable the risers thereof to be connected to the risers of similar heating and cooling units on floors above and below said heating and cooling unit.

5. The unit of claim 4 wherein said riser heat exchanger is mounted for limited sliding movement relative to said housing.

6. A unit for heating or cooling air in a multi-story building comprising an elongated housing, a fan disposed in said housing for circulating air through the housing, an elongated riser heat exchanger longitudinally disposed in said housing, means in said housing for directing the flow of air through said hous ing in one or the other of two separate paths, said means including a damper blade unit for directing the air through said one path when in a first position and through said other path when in a second position, air flowing through said one path passing over the riser heat exchanger and air flowing through said other path bypassing said riser heat exchanger, a remote controlled damper motor for moving said damper blade unit to said first and second positions, and means for dividing said housing internally into an upper and lower portion, said damper unit having an elongated lower blade positioned in said lower portion of the housing to control the flow of air over the lower portion of said riser heat exchanger and an elongated upper blade positioned in the upper portion of the housing to control the flow of air over the upper portion of said riser heat exchanger, means on both ends of said unit to enable the risers thereof to be connected to the risers of similar units on floors above and below said unit.

7. The unit of claim 6 including a hinged strap of flexible material pivotally mounting said damper blade unit with respect to said housing, said strap extending substantially the entire length of said damper blade unit to reduce the leakage of air between the damper blade unit and the portion of the housing on which it is mounted.

8. A unit for heating or cooling air in a multi-story building comprising an elongated housing having an air inlet near one end and an air outlet near the other end, an elongated heat exchanger extending through said housing, said heat exchanger including two risers extending therethrough, means on both ends of said housing to enable said risersto be connected to the risers of similar units on the floors above and below said unit, and a fan in said housing for circulating room air in said inlet over said riser heat exchanger and out said outlet, said riser heat exchanger being mounted for limited movement relative to said housing to accommodate relative expansion and contraction between said housing and riser heat exchanger in response to temperature fluctuations.

9. A unit for heating or cooling air in a multi-story building comprising an elongated housing, a fan in said housing, and a heat exchanger in said housing, said heat exchanger including two risers extending therethrough, means on both ends of said unit to enable the risers thereof to be connected to the risers of similar units on the floors above and below said units wherein the improvement comprises a drainage system comprising a drain pan enclosing the bottom of said housing to collect condensate from the fins of said riser heat exchanger, said drain pan having a short drain pipe extending downwardly therefrom for draining condensate from said drain pan, and a drain pipe extending through said housing with the lower end thereof closely overlying the bottom of the drain pan and the short drain pipe of the drain pan with an air gap between the drain pipes to permit condensate in the long drain pipe to pass directlyinto said short drain pipe without collecting in the drain pan while permitting condensate from said drain pan to pass through said air gap into said short drain pipe. 

1. A unit for heating or cooling air in a multistory building comprising an elongated housing, a fan disposed in said housing for circulating air through the housing, an elongated heat exchanger longitudinally disposed in said housing, said heat exchanger including two risers extending therethrough, means on both ends of said unit to enable the risers thereof to be connected to the risers of similar units on floors above and below said unit, and means in said housing for directing the flow of air through said housing in one or the other of two separate paths, said means incLuding a damper blade unit for directing the air through said one path when in a first position and through said other path when in a second position, air flowing through said one path passing over the riser heat exchanger and air flowing through said other path bypassing said riser heat exchanger.
 2. The unit of claim 1 including a remote controlled damper motor for moving said damper blade unit to said first and second positions.
 3. The unit of claim 2 including means in said other path for reducing the flow of air therethrough so that approximately the same cubic volume of air per minute is circulated through said unit by the fan in both said one and other paths.
 4. A heating and cooling unit for a multi-story building comprising an elongated housing, a fan disposed in said housing for circulating air through the housing, an elongated cold water riser heat exchanger longitudinally disposed in said housing for cooling said air, means in said housing for directing the flow of air through said housing in one or the other of two separate paths, said means including a damper blade unit for directing the air through said one path when in a first position and through said other path when in a second position, air flowing through said one path passing over the riser heat exchanger and air flowing through said other path bypassing said riser heat exchanger, a remote controlled damper motor for moving said damper blade unit to said first and second positions, a pair of hot water risers mounted on and extending longitudinally of said housing, a hot water heat exchanger positioned within the upper portion of said housing in said other path for heating said air, said hot water heat exchanger being connected to said hot water risers, a remote controlled valve for controlling the circulation of water through said hot water heat exchanger, function switch means for controlling said damper motor to move said damper blade unit to said first and second positions, and a thermostat for opening and closing said valve in response to room temperature changes when said damper blade unit is in said second position and for turning said fan on and off in response to room temperature changes when said damper blade unit is in said first position, means on both ends of said heating and cooling unit to enable the risers thereof to be connected to the risers of similar heating and cooling units on floors above and below said heating and cooling unit.
 5. The unit of claim 4 wherein said riser heat exchanger is mounted for limited sliding movement relative to said housing.
 6. A unit for heating or cooling air in a multi-story building comprising an elongated housing, a fan disposed in said housing for circulating air through the housing, an elongated riser heat exchanger longitudinally disposed in said housing, means in said housing for directing the flow of air through said housing in one or the other of two separate paths, said means including a damper blade unit for directing the air through said one path when in a first position and through said other path when in a second position, air flowing through said one path passing over the riser heat exchanger and air flowing through said other path bypassing said riser heat exchanger, a remote controlled damper motor for moving said damper blade unit to said first and second positions, and means for dividing said housing internally into an upper and lower portion, said damper unit having an elongated lower blade positioned in said lower portion of the housing to control the flow of air over the lower portion of said riser heat exchanger and an elongated upper blade positioned in the upper portion of the housing to control the flow of air over the upper portion of said riser heat exchanger, means on both ends of said unit to enable the risers thereof to be connected to the risers of similar units on floors above and below said unit.
 7. The unit of claim 6 including a hinged strap of flexible material pivotally mounting said damper blaDe unit with respect to said housing, said strap extending substantially the entire length of said damper blade unit to reduce the leakage of air between the damper blade unit and the portion of the housing on which it is mounted.
 8. A unit for heating or cooling air in a multi-story building comprising an elongated housing having an air inlet near one end and an air outlet near the other end, an elongated heat exchanger extending through said housing, said heat exchanger including two risers extending therethrough, means on both ends of said housing to enable said risers to be connected to the risers of similar units on the floors above and below said unit, and a fan in said housing for circulating room air in said inlet over said riser heat exchanger and out said outlet, said riser heat exchanger being mounted for limited movement relative to said housing to accommodate relative expansion and contraction between said housing and riser heat exchanger in response to temperature fluctuations.
 9. A unit for heating or cooling air in a multi-story building comprising an elongated housing, a fan in said housing, and a heat exchanger in said housing, said heat exchanger including two risers extending therethrough, means on both ends of said unit to enable the risers thereof to be connected to the risers of similar units on the floors above and below said units wherein the improvement comprises a drainage system comprising a drain pan enclosing the bottom of said housing to collect condensate from the fins of said riser heat exchanger, said drain pan having a short drain pipe extending downwardly therefrom for draining condensate from said drain pan, and a drain pipe extending through said housing with the lower end thereof closely overlying the bottom of the drain pan and the short drain pipe of the drain pan with an air gap between the drain pipes to permit condensate in the long drain pipe to pass directly into said short drain pipe without collecting in the drain pan while permitting condensate from said drain pan to pass through said air gap into said short drain pipe. 